Help me out folks. I want to get a double trailer to haul my kids around (1 and 4) but I'm having trouble finding the right trailer/hitch combo. My bike is a hardtail mountain bike with disc brakes.....other than a Burley and their alternative hitch....whats my best bet?

If you skim through the most recent three or four pages in "recreation and family", you will find several long threads with a lot of posts about selecting a trailer, and the correct methods of attaching a trailer.

He's not quite 4 yet, and only 30 pounds so he's got a ways to go. I don't think he's quite ready for a tagalong yet either.

Didn't mean to sound so dire. Was just thinking of my own 3.5 yr. old whose length and girth are starting to encroach on his 1.5 yr. old brother's space. But your youngest is still able to give up some room which helps.

The Wike trailer has a good hitch.
Another very good option is the Chariot. The mid-scale models without suspension or even the ones without the stroller/jogging kits are very decent – pricewise too – and have more cargo room than the high-end ones.

The hitch attaches to the quick release and doesn't interfere with either your feet or disc brake.